[CMake] CTest - Speed Optimization

[Stephen Kelly]

Alexander Neundorf wrote:

> On Thursday 31 October 2013, Olaf Ryder wrote:
>> Greetings,
>> 
>> I'm looking for ways to speed up CTest runs (the Experimental target). It
>> would appear the majority of the time is spent during the build step.
>> 
>> 1) What exactly is happening during the Experimental build step?
>> 2) How does CTest know what targets to build within a complex project?
> 
> I think it builds everything.

Everything except the EXCLUDE_FROM_ALL targets.

>> 3) Is there a way to get verbose output of what's going on during the
>> various steps?
> 
> Did you try ctest -V or, ctest -V -VV ?
> 
> There is a -j flag for ctest, which at enables parallel testing. Not sure
> whether it enables also parallel building.

I don't know, but I hope not. That wouldn't be a good idea because it would 
try to do N*N things at once instead of N things at once, with make.

Thanks,

Steve.